Early career

Main deeds

284 Proclaimed as emperor by the troops after the death of Numerianus, son of Carus

285 Consul suffectus II; battle of the Margus; dead of Carinus; Diocletianus is recognized by the Senate; visit to Rome; war against the Sarmatians; accepts the titles Germanicus Maximus and Sarmaticus Maximus; Diocletianus appoints Maximianus as his caesar

288 Launches an attack on the Germanic tribes, from Raetia; meeting with Maximianus; accepts the title Germanicus Maximus IV

289 War against the Sarmatians; accepts the title Sarmaticus Maximus II

290 Consul IV (with Maximianus III)

290/291 Meeting with Maximianus in Milan

292 Maximianus fights against the Alamans

Diocletian's Edict on Maximum Prices
293 Consul V (with Maximianus IV); First Tetrarchy: Galerius and Constantius I Chlorus proclaimed caesares; Diocletian's daughter Galeria Valeria marries to Galerius; all four men accept the title Germanicus Maximus, Diocletian for the fifth time; in the Sasanian Empire, Bahram II dies, and is succeeded by Bahram III, and Narseh

294 War against the Sarmatians; accepts the title Sarmaticus Maximus III; Decennalia